Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

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Region	CAMS	Morning												Afternoon							CAMS	POC	Entity
Ozone Hourly Averages for Thursday, March 23, 2023. measured in parts per billion
Region	CAMS	Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	CAMS	POC	Entity
Dallas-Fort Worth - all times are in CST
	13	29	28	26	26	25	22	21	21	23	26	30	33	PMA	39	38	37	36	38	NA	13	2 ^R ^MDL	TCEQ
	17	25	25	24	23	22	20	14	15	17	20	25	29	32	35	35	34	33	32	NA	17	2 ^R ^MDL	TCEQ
	31	28	26	25	25	24	21	19	18	18	23	29	33	37	39	39	38	37	36	NA	31	1 ^R ^MDL	TCEQ
	56	28	27	24	22	21	20	18	18	20	21	24	31	37	40	41	40	37	36	NA	56	1 ^R ^MDL	TCEQ
	61	25	24	22	19	19	18	18	19	21	23	28	31	QAS	QAS	QAS	35	34	32	NA	61	1 ^R ^MDL	TCEQ
	63	26	25	24	23	22	20	19	18	20	24	29	31	34	36	36	36	36	35	NA	63	1 ^R ^MDL	TCEQ
	69 ¹	27	26	24	23	22	19	17	13	17	23	27	29	31	33	34	35	35	34	NA	69 ¹	1 ^R ^MDL	Other Gov
	70	27	24	21	21	18	16	13	12	19	23	29	32	34	37	36	35	33	FEW	NA	70	1 ^R ^MDL	TCEQ
	71	28	28	27	26	23	18	17	18	21	25	30	34	36	38	38	39	38	38	NA	71	1 ^R ^MDL	TCEQ
	73	25	26	25	23	21	19	17	17	19	22	27	30	32	34	34	33	33	34	NA	73	1 ^R ^MDL	TCEQ
	75 ²	27	26	24	22	21	21	21	20	21	22	26	31	34	38	39	38	36	36	NA	75 ²	1 ^R ^MDL	TCEQ
	76	26	25	26	24	23	21	16	17	17	18	24	28	31	32	33	32	32	31	NA	76	1 ^R ^MDL	TCEQ
	77	25	24	23	23	22	21	19	19	20	24	28	31	34	34	35	34	35	35	NA	77	1 ^R ^MDL	TCEQ
	401 ³	24	23	21	21	19	17	15	12	17	21	24	26	29	31	32	32	33	32	NA	401 ³	3 ^R ^MDL	Other Gov
	402 ¹	27	25	25	25	23	21	19	19	22	23	25	28	31	32	33	35	34	33	NA	402 ¹	1 ^R ^MDL	Other Gov
	1006	36	36	33	28	28	26	24	23	26	32	35	37	39	41	43	44	44	42	NA	1006	1 ^R ^MDL	TCEQ
	1032	27	26	25	24	21	20	17	16	18	22	25	29	38	40	41	40	38	36	NA	1032	1 ^R ^MDL	TCEQ
	1044	27	25	24	23	23	21	20	20	24	28	30	32	34	35	36	36	35	35	NA	1044	1 ^R ^MDL	TCEQ
	1051	28	28	27	26	24	24	23	23	SPZ	28	31	33	35	36	38	38	37	34	NA	1051	1 ^R ^MDL	TCEQ
		Notes: ¹- These sites are maintained and operated by the City of Dallas. ²- These sites are maintained and operated by AECOM for North Texas Commission (NTC). ³- These sites are maintained and operated by the City of Dallas (Met NOx O3 SO2 CO). TCEQ does not certify the validity or quality of data it hosts from other monitoring entities.
		Maximum values for the day are bold within the table. Minimum values are *bold italic*.
		^R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.

Texas Commission on Environmental Quality

Ozone Hourly Averages